Publication Number: FHWA-HRT-07-006

508 Caption

Bar chart. Adhesion Strength of Overcoat Systems Before and After Laboratory Testing. The bar chart shows the adhesion strength of the overcoat systems before and after the 4,000-hour laboratory tests. The small "b" after each entry in the legend stands for "before," while the small "a" beside every second entry indicates "after." As shown, the adhesion strength values of all the overcoat systems remained about the same after the testing. The x axis is labeled "Surface For Overcoat" and consists of three groupings of 12 bars, with the first grouping (at left) labeled "Lead dash Alkyd," then "I O Z slash Vinyl," and "S S P C dash S P 3." The 12 bars per grouping represent before and after values for six overcoats: Alkyd, M C U 2, M C U 3, H B Acrylic, C S A, and Epoxy. The y axis is labeled "Adhesion Strength, P S I" and ranges from 0 to 1,800 in 200 p s i increments. The data read as follows (from left to right): For Lead dash Alkyd substrate, Alkyd overcoat before 1,144, after 1,161; M C U 2 before 1,206, after 1,243; M C U 3 before 1,131, after 1,257; H B Acrylic before 690, after 678; C S A before 344, after 432; Epoxy before 1,213, after 1,236. For I O Z slash Vinyl substrate, there were no data for Alkyd before and after; M C U 2 before 1,050, after 998; M C U 3 before 812, after 807; H B Acrylic before 466, after 474; C S A before 344, after 342; Epoxy before 955, after 1,061. And for S S P C dash S P 3 substrate, Alkyd overcoat before 1,314, after 1,277; M C U 2 before 1,403, after 1,410; M C U 3 before 1,555, after 1,455; H B Acrylic before 411, after 542; C S A before 352, after 396; Epoxy before 1,504, after 1,298.

Graph plot. Rust Creepage at the Scribe on Alkyd Surfaces. This plot shows observed creepage of six coating materials applied over alkyd surfaces. The y axis indicates accumulative rust creepage at the scribe on a scale of 0 to 7 millimeters. The x axis indicates test time in hours on a scale of 0 to 4,000 hours. Creepage for each of the materials progressed approximately linearly, except that there was no observed creepage for calcium sulfonate, or C S A, between 2,000 and 4,000 hours. Rust creepage at the scribe on H B acrylic measured from about 1 millimeter at 2,000 hours to about 5.8 millimeters at 4,000 hours. Rust creepage at the scribe with alkyd measured from about 0.5 millimeter at 1,000 hours to about 4.8 millimeters at 4,000 hours. Rust creepage at the scribe with M C U 3 measured from about 1 millimeter at 1,500 hours to about 4.2 millimeters at 4,000 hours. Rust creepage at the scribe with epoxy measured from about 0.4 millimeter at 1,500 hours to about 3.7 millimeters at 4,000 hours. Rust creepage at the scribe with M C U 2 measured from about 0.5 millimeter at 1,500 hours to about 3.2 millimeters at 4,000 hours.

This data flowchart, titled "TransNet Dashboard Data Flow," contains a central circle labeled "TransNet Dashboard" with arrows leading to 10 circles labeled, clockwise, "Public" (in color), "SANDAG Board," "MTS," "NCTD," "Caltrans Staff," "SANDAG Staff," "Other Agencies," "Cities/County," "Contractors/Consultants," and "ITOC." Arrows lead up to the central circle from boxes below it labeled "Budget/Expenditures," "Scheduling," and "Scope/Risk/Cost Estimates."s Within the Budget/Expenditures box are seven circles connected by arrows pointing up from the bottom. The circles are labeled (starting from the top): "Actual Dollars Expended," "'Middleware' Financial Data," and (two sets of circles leading to that circle), on the right, "SANDAG Financials (IFAS)" and "SANDAG Financial Information; Actual," and, on the left, "Caltrans Financials (FIDO/TRAMS)" and "Caltrans Financial Information; Actual Time Charges." On the far left is a circle labeled "Program Funding and Budgeting" and connected from the left to the "Middleware" Financial Data circle. Inside the Scheduling box are four circles connected by arrows pointing up from the bottom. The circles are labeled (starting from the top): "Earned Percent Complete," "Earning Rules Established," "Resource Loaded Schedules," and "Logic Based Schedules." The Scope/Risk/Cost Estimates box has four circles connected by arrows pointing up from the bottom. The circles are labeled (starting from the top): "Cost Management System," "Corridor Directors Trends, Risks, Issues, Progress Input," and "Project Manager Trends Risks, Issues, Progress Input." The fourth circle, labeled "Project Cost Estimates; Project Changes," is on the right side with an arrow pointing to the top circle. The following legend is included:

Graph plot. Rust Creepage at the Scribe on I O Z slash Vinyl Surfaces. This plot shows observed creepage applied over aged I O Z slash Vinyl surfaces. The y axis indicates accumulative rust creepage at the scribe on a scale of 0 to 4.5 millimeters. The x axis indicates test time in hours on a scale of 0 to 4,500 hours. Creepage for each of the materials progressed approximately linearly, except that there is only one plotted point for C S A. Rust creepage at the scribe on M C U 3 measured from about 0.4 millimeter at 1,500 hours to about 4.25 millimeters at 4,000 hours. Rust creepage at the scribe with M C U 2 measured from about 1.5 millimeters at 2,000 hours to about 3.75 millimeters at 4,000 hours. Rust creepage at the scribe with H B acrylic measured from about 0.8 millimeter at 3,000 hours to about 2.4 millimeters at 4,000 hours. Rust creepage at the scribe with epoxy measured from about 0.5 millimeter at 3,000 hours to about 1.8 millimeters at 4,000 hours. Rust creepage at the scribe with C S A has just one plotted point, about 1.1 millimeters at 4,000 hours.

Graph plot. Rust Creepage at the Scribe on S S P C dash S P 3 Surfaces. This plot shows observed creepage of five coating materials applied over S S P C dash S P 3 steel surfaces. The y axis indicates accumulative rust creepage at the scribe on a scale of 0 to 7 millimeters. The x axis indicates test time in hours on a scale of 0 to 4,500 hours. Creepage for each of the materials progressed approximately linearly, except that there was no observed creepage for C S A between 2,500 and 4,000 hours. Rust creepage at the scribe on H B acrylic measured from about 0.8 millimeter at 500 hours to about 6.5 millimeters at 4,000 hours. Rust creepage at the scribe with M C U 2 measured from about 0.7 millimeter at 500 hours to about 5.2 millimeters at 4,000 hours. Rust creepage at the scribe with epoxy measured from about 0.9 millimeter at 1,000 hours to about 5.0 millimeters at 4,000 hours. Rust creepage at the scribe with M C U 3 measured from about 1.8 millimeters at 1,500 hours to about 4.8 millimeters at 4,000 hours. Rust creepage at the scribe with alkyd measured from about 1.3 millimeters at 1,500 hours to about 3.8 millimeters at 4,000 hours. There was no observed creepage for C S A between 2,500 and 4,000 hours.

Graph plot. Rust Creepage at the Scribe Versus Exposure Time. This plot shows observed creepage developed by six coating materials after 24-month outdoor exposure. The y axis indicates accumulative rust creepage at the scribe on a scale of 0 to 8 millimeters. The x axis indicates exposure time in months on a scale of 0 to 30. Creepage for each of the materials progressed approximately linearly. Rust creepage at the scribe on M C U 2 measured from about 4.0 millimeters at 12 months to about 6.75 millimeters at 24 months. Rust creepage at the scribe with M C U 3 measured from about 3.5 millimeters at 12 months to about 6.1 millimeters at 24 months. Rust creepage at the scribe with epoxy measured from about 2.6 millimeters at 12 months to about 5.0 millimeters at 24 months. Rust creepage at the scribe with alkyd measured from about 2.5 millimeters at 12 months to about 4.75 millimeters at 24 months. Rust creepage at the scribe with C S A measured from about 2.5 millimeters at 12 months to about 4.6 millimeters at 24 months. Rust creepage at the scribe with H B acrylic measured from about 1.1 millimeters at 6 months to about 4.6 millimeters at 24 months. There was no observed creepage for C S A between 2,500 and 4,000 hours.
The formula derived for creepage with M C U 2 is: lowercase y equals 0.2983 times lowercase x, where R squared equals 0.8667. The formula derived for creepage with M C U 3 is: lowercase y equals 0.258 times lowercase x, where R squared equals 0.9441. The formula derived for creepage with epoxy is: lowercase y equals 0.2201 times lowercase x, where R squared equals 0.9289. The formula derived for creepage with alkyd is: lowercase y equals 0.2139 times lowercase x, where R squared equals 0.9893. The formula derived for creepage with C S A is: lowercase y equals 0.2132 times x, where R squared equals 0.7252. The formula derived for creepage with H B acrylic is: lowercase y equals 0.1845 times lowercase x, where R squared equals 0.8839.

Graph plot. Rust Creepage at the Scribe Over S S P C dash S P 3 Steel Surfaces Versus Exposure Time. This plot shows observed creepage developed by six coating materials after 24-month outdoor exposure. The y axis indicates accumulative rust creepage at the scribe on a scale of 0 to 18 millimeters. The x axis indicates exposure time in months on a scale of 0 to 30. Creepage for each of the materials progressed approximately linearly, except that there was no observed creepage for C S A between 18 and 24 months. Rust creepage at the scribe on epoxy measured from about 3.0 millimeters at 6 months to about 17.0 millimeters at 24 months. Rust creepage at the scribe with H B acrylic measured from about 1.0 millimeter at 6 months to about 5.0 millimeters at 24 months. Rust creepage at the scribe with M C U 3 measured from about 1.0 millimeter at 6 months to about 5.0 millimeters at 24 months. Rust creepage at the scribe with alkyd measured from about 1.5 millimeters at 6 months to about 4.3 millimeters at 24 months. Rust creepage at the scribe with M C U 2 measured from about 0.3 millimeters at 6 months to about 3.0 millimeters at 24 months.